# Icosahedron Inscribed in Octahedron

## Theorem

An icosahedron inscribed in an octahedron involves the Golden Ratio.

## Proof

## Sources

- 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $1 \cdotp 83928 \, 67552 \, 1416 \ldots$

- 1998: John Sharp:
*Have You Seen This Number?*(*The Mathematical Gazette***Vol. 82**: 203 – 214) www.jstor.org/stable/3620403